Improvement in artificial teeth



MPETERS, PHOTO-LITHQGRAFMER, WASHINGTON D c @anni chemin.

To all whom it may concern JEHU H. WOOD, or LEBANON, OHIO.

Laim Patent No. 102,193, Macaw-119, 1870.

IMPROVEMENT IN' ARTIFICIAL TEETH.

The Schedule referred to in these Letters Patent and making part o! thesame.

Be it known than 1,'JEHU H. Woon, ofn'bauon, in, the county of Warrenand State of Ohio, have n- 'vented'certain new and useful Improvementsin Artiv ficial Teeth and I do' hereby declare that the following is a.full, clear, and exact description thereof, suftoient to enable thoseskilled in the art to which my invention appertains to make and use thesame, reference being had to the accompanying drawings making part ofthis specification, in which- Figure l represents a set of teeth withone of the blocks removed. f

Figures 2 and 3 represent blocks formed with dove- `tails anddepressions, hereinafter described.

Thenature of my invention consists in constructing artificial teeth, orblocks of teeth, with double dovetailed depressions at the ends,extending from near the outer surface entirely back to and. includingthe inner surface, and incliningor deepening both toward the' center ofthe outer surface and toward the cutting-edges, so that, when attachedto aluminum plates,

they are securely clamped by the metal.

The teeth are made either single orin sections or blocks.

Instead of being notched'for rivets, as iu those used for rubber work,the porcelain extends out as far as the rivets would extend, forming aueven surhe porcelain is raised iu the center of each block or the centerof each tooth, forming a slight bead. v

The ends of the blocks or the sides of each tooth, when single teeth areused, are made slightly smaller atashort distance from the base thanthey are directly at the base, and have formed on them what I calldouble dovetailed depressions, as shown in fig. 2, so that, when theblocks are in position on the plate,

the portion ofthe metal that is between the ends of the blocksforms'adouble dovetail or a dovetail inclining inwardly toward thecenters of the-blocks, and also toward the cutting-edges of the teeth.

lhe ends ofthe blocks may also have holes in them, as shown in fig. 3,so thatthe` metal will assume the form of rivets, as shown in fig. 1.

rIhe teeth are arranged on a wax plate, as is usual for rubber work,with small spaces left between them' to allow for shrinkage of themetal. v

` They are then placed on a. model or cast and an impression of them istaken in a flask, which is made iu sect-ions and secured together bylugs and keys, or in any other suitable manner.

When the plaster impression has lbecome. suffici-V ently hard, the waxis melted olf, and the aluminum poured in.`

The metal runs over the body of the blocks, filling the depressions andclamping the blocks securely,A

the bead in the center of each block or-tooth separating the'metal, soas to prevent too great contraction of the metal on the teeth, and themetal forming so thin'that it will bend as it contracts, instead ofcrushing or breaking the teeth.

.What I claim as, newand desire to secure by Let- V ters Patent, is-

Artificial teeth or blocks of teeth Vformed with double dovetaileddepressions at the ends, extending from near the outer surface entirelyback to and includingthe inner surface, and inclining or deepening bothtoward the center of the outer surface and toward the cutting-edges, sothat the metalr runs be-A tween the blocks from nearI the outer surfaceenf tirely back to the inner surface, extending from one end of eachblock around the inner surface to the other end, as v-shownand'described.

J. H. WOOD.Y Witnesses:

E. R.BROWN, C. C. THEAKER;

